UFC 4-159-03
3 October 2005
Figure 8-13. Wind Forces and Moments on a Nest of Four DD 963 Class Vessels
for a Wind Speed of 78 mph (35 m/s)
CURVE
GRAPH
MAX.
LIMITS
VALUE
(1)
Transverse
E5 N
447.4 kips
Wind Force
(2)
Longitudinal
E5 N
231.3 kips
Wind Force
(3)
Yaw Moment
E6 N
47643 kip-ft
To ensure the mooring legs are efficient in resisting the imposed
environmental horizontal forces, a target horizontal distance of 170 feet (52 meters) is
chosen between the predicted daylight location (where the chain exits the soil) and the
attachment point on the ship for each of the mooring legs. Therefore, anchor locations
are established at a horizontal distance of 270 feet (82 meters) away from the vessel.
8-4.6
Definitions. In this example, a local ship and a global coordinate system
are defined. The local ship coordinate system is used to determine environmental loads
at the various wind and current attack angles, as shown in Figure 4-2, with the origin of
171
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